Shure BLX288/SM58 Combo M17, SM Vocal Series, Dual UHF Wireless-System with 2x SM58 handheld transmitter, up to 6 Systems parallel, Pilottone, antenna-Diversity, Quick-Scan to find free frequencies, dynamic SM58 capsule, 50 - 15.000 Hz, cardioid, receiver with plastic housing, internal antennas, XLR- and Jack outputs, Audio Status-LEDs, frequencyrange M17 662 - 686 MHz